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std::chrono...day_indexed(3)   C++ Standard Libary  std::chrono...day_indexed(3)

NAME
     std::chrono::weekday_indexed - std::chrono::weekday_indexed

Synopsis
	Defined in header <chrono>
	class weekday_indexed;	    (since C++20)

	The  class weekday_indexed combines a weekday, representing a day of the
     week in the
	proleptic Gregorian calendar, with a small index n in the range [1,  5].
     It
	represents  the  first,  second, third, fourth, or fifth weekday of some
     month.

	weekday_indexed is a TriviallyCopyable StandardLayoutType.

Member functions
	constructor   constructs a weekday_indexed
		      (public member function)
	weekday       access the stored weekday
		      (public member function)
	index	      access the stored index
		      (public member function)
	ok	      checks if the weekday and index are both valid
		      (public member function)

	Nonmember functions

	operator== compares two weekday_indexed values
	(C++20)    (function)
	operator<< outputs a weekday_indexed into a stream
	(C++20)    (function template)

Helper classes
	std::formatter<std::chrono::weekday_indexed>  formatting   support   for
     weekday_indexed
	(C++20) 				     (class template specializa-
     tion)
	std::hash<std::chrono::weekday_indexed>      hash support for
	(C++26) 					std::chrono::weekday_in-
     dexed
						     (class template specializa-
     tion)

Example
     // Run this code

      #include <chrono>
      #include <iostream>

      int main()
      {
	  using namespace std::chrono;

	  constexpr weekday_indexed wi = Friday[2];

	  // Indexed weekday can be used at any place where chrono::day  can  be
     used:
	  constexpr year_month_weekday ymwd = 2021y / August / wi;
	  static_assert(ymwd == August / wi / 2021y &&
			ymwd == wi / August / 2021y);
	  std::cout << ymwd << '\n';

	  constexpr year_month_day ymd{ymwd}; // a conversion
	  static_assert(ymd == 2021y / 8 / 13);
	  std::cout << ymd << '\n';
      }

Possible output:
      2021/Aug/Fri[2]
      2021-08-13

http://cppreference.com 	   2024.06.10	    std::chrono...day_indexed(3)
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